蒸汽时代的大潮因他而到来——
瓦特
本题考查的是工业革命。瓦特改良蒸汽机使人类进入蒸汽时代。
— Sorry for what I have said to you.
—_______.
A．Let’s forget it.
B．No, of course not.
C．No, nothing much.
D．Pardon?
简述心脏杂音的分类方法？
